BIO120H1 Final: Study notes for spring semester labs

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BIO120H1 Full Course Notes

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Ex. eutrophication: continuous pollution from agricultural run-off or sewage outflows (human or animal) concentrations to too-high levels and numbers of algae and algae-eaters. Fertilizers and sewage, being high in nitrogen and phosphorous, increase. Algal bloom covers water surface, kills plants below from lack of. high oxygen levels, green algae predominate; low oxygen levels, cyanobacteria dominate. Bacteria feed on dead matter, using oxygen and releasing carbon dioxide and toxic compounds. Aquatic organisms, both plant and animal, deprived of oxygen die. Experiment: to observe the effects of no-fertilizer (control), moderate-fertilizer, and high-fertilizer treatments on aquatic environment containing phytoplankton and salvinia o. Free-floating water fern, pair of leaves above water and connecting stems: salvinia molesta (kariba weed) and divided leaves below water. Total amount of dissolved ions in water, measured in microsiemens/cm ( /cm) Polluted waters have higher conductivity than unpolluted waters. Indirect indicator of salinity, detecting chloride ions from salt.

Related Questions

The nitrogen cycle describes the fluxes of nitrogen atoms among air, land, and water. Nitrogen enters the atmosphere in the form of N2O or N2 gas when people burn fossil fuels. Nitrogen enters soil as bacteria convert atmospheric nitrogen to NO3-, which can be absorbed by plants. Water contacting soil will pick up nitrogen and carry it to a lake or ocean. In recent decades, the use of fertilizers containing nitrogen has increased the amount of nitrogen that flows into lakes and oceans, causing blooms of algal referred to as eutrophication.

Use this information and your knowledge about biology to answer questions 16-20.

16. All of the nitrogen in fertilizers will end up in bodies of water. True or False

17. If the supply of nitrogen limits the growth of plants, emissions from burning fossil fuels should lead to more biomass of plants. True or False

18. A teleconnection occurs when nitrogen introduced as fertilizer ends up causing algae to bloom in the ocean. True or False

19. Negative feedback would occur if emissions of fossil fuel increase the rate of nitrification by bacteria. True or False

20. Positive feedback occurs when nitrification by bacteria causes the population of bacteria to grow. True or False

Please explain your answer if you can. Thank You!

What is the difference between planktons and nektons?

A. planktons are algae and cyanobacteria, nektons are larger plants

B. planktons are autotrophic, nektons are heterotrophic

C. planktons are mostly microscopic, nektons are macroscopic

D. planktons are in both freshwater and seawater, nektons are only in freshwater

The distribution of life in aquatic ecosystems are determined by;

A. all these factors determine the distribution of life

B. quality and quantity of light available at different depths

C. temperature changes at different depths

D. oxygen availability at different depths of water

Which of these would you find in the benthic zone of a freshwater lake?

A. large fish

B. submerged flowering plants

C. bacteria

D. green algae

The littoral zone of the ocean is characterized by;

A. the constantly high salinity in water
B. the presence of kelp forests
C. the presence of large marine animals
D. the presence of higher plants

1. Animals which practice external fertilization ensues success by

a. providing for a few large eggs that are easily reached by sperms

b. neutralizing unfavorable environmental conditions

c. discharging a large numbers of gametes

d. timing activities under the cover of darkness

2. The process by which the unicellular organism, such as amoeba, engulfs a food particle by first inclosing with it within a pseudopodium and then packaging it in a membrane

bounded vacuole is called

a. pinocytosis c. monocytosis

b. phagocytosis d. exocytosis

3. A researcher treats a solution containing animal cells with ouabain, a substance that interferes with the Na+/K+ pump

embedded in the cell membrane and causes the cell to lyse. Which of the following statements best explains ouabainâs

mechanism of action?

a. Treatment with oubain results in high levels of extracellular Ca2+.

b. Treatment with oubain results in high levels of extracellular K+ and Na+.

c. Treatment with oubain increases intracellular concentrations of Na+.

d. Treatment with oubain decreases intracellular concentrations of Na+

BIO120H1 Final: Study notes for spring semester labs

BIO120H1 Full Course Notes

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